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US4172224A
Expired / Lapsed
US
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Process for the detection of micro-cracks
Assignee: United States Department of Energy
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Filing: 1978-10-24
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Granted: 1979-10-23
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Expires: 1998-10-24
Abstract
Abstract A process for the nondestructive testing of ceramic objects to detect the presence of defects and micro-cracks in the surface in which a solution of silver nitrate is applied to the surface of the object which penetrates into the surface defects, drying the object so that the silver nitrate remains in the defects, and preparing an X-ray radiograph whereby any defects and micro-cracks will appear in the radiograph.
Inventors
- 👤 Norman Lapinski
- 👤 Allen Sather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:42
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/18; G01N23/083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
A process for detecting defects and micro-cracks in the surface of ceramic objects comprising: applying a solution of silver nitrate to the surface of the object so that the solution penetrates any defects and cracks in the surface of the object, drying the object whereby the silver nitrate remains in the cracks and defects, and preparing an X-ray radiograph of the object whereby any defects and cracks in the surface of the object are visible in the radiograph.
Claim 2
Dependent Claim
78 words
A process for detecting defects and micro-cracks in the surface of ceramic objects comprising: applying a solution of silver nitrate to the surface of the object so that the solution penetrates any defects and cracks in the surface of the object, drying the object whereby the silver nitrate remains in the cracks and defects, and preparing an X-ray radiograph of the object whereby any defects and cracks in the surface of the object are visible in the radiograph.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the solution contains 30 to 75 weight percent silver nitrate and up to 1 weight percent of a surface tension reducing agent.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the solution contains 45 to 55 weight percent silver nitrate.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein the solution is applied by immersing the object in the solution.
References Cited (Backward Citations)
US3704370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |